From 1972 until 1995 each competition had a single paper of 5 questions (to be solved in 3 1/2 hours). Thereafter each competition has had two papers each with 3 questions (originally 3 hours for each paper, 4½ hours from 2002). So there are a total of 168 problems to date.

I have put up solutions for all problems.

Archive

1st USAMO 1972 2nd USAMO 1973 3rd USAMO 1974 4th USAMO 1975 5th USAMO 1976 6th USAMO 1977 7th USAMO 1978 8th USAMO 1979 9th USAMO 1980 10th USAMO 1981	11th USAMO 1982 12th USAMO 1983 13th USAMO 1984 14th USAMO 1985 15th USAMO 1986 16th USAMO 1987 17th USAMO 1988 18th USAMO 1989 19th USAMO 1990 20th USAMO 1991	21st USAMO 1992 22nd USAMO 1993 23rd USAMO 1994 24th USAMO 1995 25th USAMO 1996 26th USAMO 1997 27th USAMO 1998 28th USAMO 1999 29th USAMO 2000 30th USAMO 2001	31st USAMO 2002 32nd USAMO 2003

 
 
 
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© John Scholes
jscholes@kalva.demon.co.uk
27 Aug 2002
Last corrected/updated 6 Nov 03